| The effects of different conservation tillage on soil physical structures of dry farmland in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2010.04.36 |
| Key Words: conservation tillage loess plateau no tillage residue coverage |
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| Abstract: |
| In order to investigate the effects of different tillage practices(T:conventional tllage, TS:conventional tillage with straw incorporated, NT:no-tillage without straw covering, NTS:no-tillage with straw covering) on soil physi-cal and chemical properties in plough layer, an experiment was conducted at corn plots with conservational tillage for four years in and and semiarid areas of the Loess Plateau. The results showed that, NTS treatment may significantly reduce
the soil bulk density of 0~5 cm layer, TS and NTS treatments may significantly reduce the soil bulk density of 5~10 cm and 10~30 cm layer; NTS can significantly increase the soil porosity of 0~5 cm layer, TS and NTS may significantly
improve the soil porosity of 5~10 cm and 10~30 cm layers; NTS treatment may significantly reduce the level of soil
compaction of each layer, and other treatments have no significant efecte on the top 0~5 cm layer, while NT treatment significantly increases the soil compaction below 5 cm; NTS increases the soil hydraulic conductivity of 0~5 cm layer, while the NT treatment significantly reduces it; the content of large water- stable aggregates is listed as NTS> NT> TS>T. Based on our research, so NT treatment has no remarkable effect on the improvement of soil physical structures, while NTS treatment has the best performance. |
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